Pipe-threading tool.



I. W. NONNEMAN.

PIPE THEBADING TOOL.

APPLICATION FILED nuns, 1914.

1,1 15,727. Patented N0v.3, 1914.

arm/humus 4 h %M THE NoRklS PETERS CO.. PHOTOLHHO., WASHINGTON. D 1..

UNITED STATES PATENT-enrich IR W. NONNEMAN, or WARREN, OHIO, AssIGNoRro irnn Bonnmv COMPANY, or l wARnEN oHIo, A CORPORATION or OHIO. r

PIPE-THREADING' TOOL.

To all whom it mayconcem I Be it known that I, IRA W. NONNEMAN, of

lfiVarren, in the county of Trumbull "and State of Ohio, have; invented certain new and useful Improvements r in Pipe-Threading Tools; and I do hereby declare the fol-,

lowingto be a full, clear, and exact description of the invention, such as will enable others skilled inltheart to which it appertains to make andyuse the same.

The primaryobject of thisinve'ntion is i to obtain perfect thread formations onpipes of different diameters with one set of chasers' having each a single cutting face.

It is well-known in the art that chasers having single cutting faces formed on one thread inclination in threading pipes of different sizes are capable of producing a perfect thread on only one size, namely, the

size corresponding to the tap by which. the chasers were threaded, and in consequence the threads on pipesof other diameters are more "or less imperfect. This difficulty-is overcome, according to my invention, by changing the angle of the cutting faces of the chasers relatively tothe axis of the tool for each size of pipe, so that the thread angle of the chasers will always be exactly what is required, resulting in, obtaining perfect threads with the standard numberof convolutions per inch for each size;

In the accompanying drawings, Figure 1 is an end elevation-ii. Fig; 2 is a side VieWe Fig. 3 is a fragmentary view. Fig. tshows" a slight modification of the slot 1n the ohaser-carrier. Fig. 5 is a view of a post.

I I havefshown my improvements as; applied to a pipe-cutting tool .of theclass known as the crossbar and of Which Letters Patent No. 1,056,085 of March18,

191.3, and No. 1,076,188 of October 21,1913,

are illustrations, and while theinvention is of special advantage 1n. tools of thls class,

it is also advantageous in tools which require for their successful operation the use of a'lead screw and a cooperatingworkholder. I

ltly improvement is particularly designed for that class of tools employed for cutting tapered threads, the necessary taper being a being reduced Specification of Letters Patent. P tent 3 1 Application filed January 19, 1914.. Serial me e.

J produced the gradual recession of the chasers as the cutting operation progresses,

but it may be used in any tool designed to out threadsonpipes of different diameters.-

I Referring to the drawings,.1 designates the chaser-carrier which is shown as pro vided withthejxusual handle sockets 2 and work-guide 3, the tool-being normallyero-w tated by the operatorgrasping-the handles.

In this chaser-carrier are formed a series of radially arranged sockets A, each of which hasa cylindrical bore open at its opposite ends. The chasers 5, which are designed corresponding formation in cross section,

to fit in these" cylindrical sockets, are of '65. at their/inner. ends whereon the cutting threads are formed. Each chaser has a lugfi projecting therefrom and which extends through a slot 7 formed in the carrier and opening into the sockets. Each slot is arranged diagonally to theaxis of the chaser socket but parallel with theplane thereof. A center line drawn through a chaser lug slot at any point thereof will intersect the axial center of the chaser. In Figs. l to' 3 these slots are shown as having straight corresponding parallel walls, but in Fig. 4 the slot is shown as composed of a series of connecting stepped sections 7*. ,I prefer this latter construction for that in the recession of the chasers during a thread- I ing operation the I angle of their cutting faces relatively to the axis of the tool re mains unchanged, i

- In the drawings I have'shown a chaserengaging plate8 provided, as usual, with a seriesof cam slots 9 for taking in the chaser I lugsso that, in a known way,; the recessions of the chasers will be, controlled as the threading operationprogressesn The rotation of the chaser-engaging plate relatively of thechasers as the cutting operation pro- :gresses, and likewise by rotating this cam I 1 platepthe chasers may beadjusted to, pipes or other. 3 articles of different diameters to the chaser-carrier controls the recession within the-range of the tool. Any suitable means 'may-be employed for actuating, or

cross-bar carrying a stop 16 for 'enga ing the end of the work or pipe topreyent the posts from partaking of the longitudinal" 511M615 ihe haser-ear ie se f atures being "well-known, further reference thereto is unnecessary. So far as the-present invention is concerned it is immaterial whether the chaser-engaging plate be posi' ti-vely rotated relatively to'th'e chaser-car'- rier by the post or by the pressure of the work acting outwardly on, the chasers.

1 Asthe chasers are adjusted to fit the pipe to be threaded, they are turned axially as they are moved longitudinally in their socket-s, thus changing the angle of their.

cutting faces" to conform to the "diameter'of the work, with the result that regardless of the inclination a perfect thread will be formed on each size of-pipe within the range of the tool. Vere the angle of the cutting face always the same for'all sizes, as has been the case heretofore, imperfect threads would be formed in each instance save one.

- volutio'ns to the inch for each size.

For instance, in tools capableof threading pipes of difierent diameters, the chaser threads are always out on an'angle required for the largest size, and it'follows that in cutting threads on pipes of less diameter the threads are not perfect-,since where the thread pitch on several sizesis the same the inclination of the threads around the smallest size is much steeper thanthe "inclination on the largest size. But by axially adjusting the chasers the angle of the cutting faces is changed to conform to the Work required. I

When the walls of the slots through which the chaser'lugs'projectare on uniform parallel lines there is a'slight. change in the angle of the cutting faces ofthe' chasers as the work progresses due to the recessionof the chasers, but thisifs insufficient to impair the integrity of the thread. But by making the slots in stepped sections, as in'Fig. 4;, there is no axialturning during recession. The advantages of-my invent-ion willbe readily appreciated. By rotating the chasers' the thread angle of the cutting faces thereof" can be brought to exactly what is required-for each diameter of pipe, and in consequence the proper thread formation is obtainedwith theuniform number of con- It will also be noted that by reason of the cylindrical bores or sockets and the corresponding formation of the chasers the sockets form complete housings or coverings for the chasers, and thus dispense with clamping means for holding the latter at true right angles to the axis of the tool.

I claim as my invention: 7

1:. In a threading tool, in combination, a chaser carrier, a -series of chasers, means for adjusting the chasers, andlmeans cooperat- 111g with the chasers for'changing the angle of thecutting faces thereof as they are ad vjusted for articles of different diameters.

In a'threading tool, in combination, a chaser carrier, a series of chasers, means for ad usting the chaserslongitudinally of their axes,"a'nd' means for axially rotating chasers as they are adjusted for articles of difi'erent diameters.

a-threading tool, in combination, a chaser carrier, a series ofchasers, means for controlling the recession'of thechasers during "th e cutting operation, and means for ch'a'ngingfthe angle of the cutting faces of the 'chaserS 'astheflatter are'adjusted for articles of 'difierentdiameters.

14. In a threading tool, a chaser-carrier having cylindrical sockets, chasers of cylindrical fformati'on in cross section fitted in s'aidfsockets', and means foraxially rotating said chasers as they are adjusted longitudinally for articles of different diameters.

5. A threading tool comprising a chasercarriena series of radially arranged chasers, an element common to all the chasers for adjusting them for articles of difierent diameters, and means for axially rotating said chasers as they are adjusted by said element.

- 6. In a threading tool, a chaser-carrier having cylindrical socketsand slots opening into said sockets and arranged at an angle thereto, chasers of cylindrical formation in cross-section fitted insaid sockets and having lugs projecting through said slots, said chasers being axially rotated as they are moved longitudinally.

7. In a threading tool, a chaser-carrier having cylindrical sockets and slots opening into said sockets and arranged at an angle thereto, chasers of cylindrical formation in cross-section fitted" in said sockets and having lugs projecting through "said slots, a chaser-engaging plate having cam slots for taking in said lugs, and means cocperating with said plate'for controlling the recession ofthe chasers. a

8. A threading tool comprising a chasercarr'ier having cylindrical sockets and slots openinginto said sockets arranged at an angle thereto, said slots being composed of stepped sections, each section having walls substantially parallel with the axis of the sockets, and chasers of cylindrical formation fitted in said sockets and having lugs proj ecting into said slots.

'9. A thread cutting tool comprisin a chaser-carrier having cylindrical sockets 1,115,72? I 1 i v 1 open at their opposite ends, chasers of cy- In testimony whereof, Ihave signed this lindrical formation fitted in said Sockets, specification in the presence of two subscrib- IRA VW.VNYONNEMAN.-

means for axially rotatin the chaser-s as lng' Witnesses. they are adjusted for articles of different 5 diameters, and means for controlling the re Witnesses: cession of the Chasers as the cutting oper- M. W; ECHTEL,

ation progresses. I R. OTT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G 

